feat: add minimal chart to display API data with hardcoded parameters

server/frontend/public/assets/js/api.js

@@ -0,0 +1,16 @@
+const API_BASE = 'http://192.168.1.195:8000'
+const DEV_EUI = '0586fe41112d83d9';
+
+async function fetchConsumption({ start, end, granularity }) {
+  const params = new URLSearchParams({ start, end, granularity });
+  const url = `${API_BASE}/readings/${DEV_EUI}?${params}`;
+
+  const result = await fetch(url);
+  if (!result.ok) {
+    const err = await result.json().catch(() => ({}));
+    throw new Error(err.detail || `Erreur HTTP ${result.status}`);
+  }
+  const raw = await result.json();
+
+  return raw.points;
+}